Valve-pad press



June 10,'1930. c. MAYNARD VALVE PAD PRESS Filed Nav. 15, -1928 INVENToR.

CHARLES EDGMIP MMPMPD.

' ATTORNEY.

Vao

Patented June., 10, A l i f 0F MASSACHUSETTS i invention relates 'to pres-'ses and more.

particularly toa press for 'use in the v mann- 'acture ofvairbagsp/that are used in the" vulcaiiizationof pneumatic'tires and has'for its object to providev a press which will perform all of the stitchingfoperations necessary tol the manufacture of an airbag.l Further objects will be apparent from the followingV specification and claims and in the drawings kwhich illustrate oneembodiment of my invention:

Fig. 1 is a side viewy of my invention'shown in inoperative position;l L f Fig. 2 is a front view ofthe machine shown inFig,1; Fig. 3 is a sectional view taken on the line 3-3 of Fig. 2, but on a larger scale;V

Figs. 4 and 5 are partial sectional views similar to Fig. 3, but showingdiferentopf erating positions of the parts; y l

Fig. 6 is a perspective view showingV attachments which may be used with the ma-y chine and Fig. 7 is a perspective view Vofla valve pad"k for an airbag. e I Y Referring toV the drawings 10 represents a Viframe on which is mounted a two-wayair cyll inder 11 controlled by a valve 12. A handle i 13 on the valve 12 vmay be operated to place the latter in neutral position or ateither of two operating positions, one of whichadniits compressed airfrom a supply'pipe 14 intoa pipe 15 connected to the `top of cylinder 11. and at the same time opensthebottom 'of the cylinder through a pipe l16 to an exhaust port in the valve 12, while the other operating position reverses the-'order and admits air from pipe 14 rinto pipe '16 and tor the bottom of the cylinder while at the same time opens the top to the exhaust through pipe 15.

. standard commercial type thedetails of which rare well known, hence they are n ot shown in 14, thus enabling the operatorto control theairsupply to start-'or stopk the-action of the cylinder 11' when the valve-12 is aty either of its operating positions. Of course lwhen doesthisquickly and completely` thus *providingy against any operati-on ,ofthe l.in Fig3,'beafrsa,r0d21atthefend offwhich is mounted va freely rotatable'roll 22. This roll 'engages vbetween the two'upright vmembers 23 of the frame 10 soavstopreventanyrota-l :tion off the sleeve`20 on the piston rdjf19. A* n ses Y 1 Y f hand-'lever 24`pivotedto the ,"frame 11"fatA 25 sistance due t'o vatmosphericpressure; 1

.. enemies EDGAR 'nnynlfiangforf "Nomisma/irren, fivrnssncrru'snrrs, fnssienon'iiofa'rnn qffrrsx nUBBEn,coMPANY,-or-cnioornn FALLS, MAssACHUSETTs, -aoonronnrion thefvalveV 12 is atfneutal.positionno acti/onl A i' takes plan-cesorv that when themachine is'ino'p! l c v erative,jas shown'in Figs. V'1'A andi2,'it willnot I :operate vunless Vboth!pv'alvpes are manipulated, 1

l55 .machine due to lan accidental'manipulation y f :f oneolhe'valves.: f` 'ff'Thepis'ton"'rod'19A ofthecylinder 11f'isy -v Mounted between the two uprightfinembers 523 .of the `)frame y'-10 is ykan jarm l32 thev .end-:'33 -ofwhichy is'ro'unde'd 'joli'. lTheV underside of 1; 1 y the arni'32 islshaped to "conformto thetopV g 'side ofa valvepad 43;shown'inFig.7,and` Y ia11101934',whichis;minne-'Wahl argh-01 ,l y -of the.k `o'on'caved"platen '30,? extends to"the '.OPO'fh 'ilIlBQ-Q; L. Y i''' One 'of-the'methodslot,manuacturing airl ;bag s consists of' forming f rubber vsheets "into V fa tube on'a'mandrel and then skiving the ends.;k c, o toproducearubbertube 35 asshown inFi. lhe valve 12, as shown 1n Figs. 1 and 2,1s of a 1.4? Avyalve` mi@ npwhh is .mQulded ,ea )valve stemv 36 is'po'sitioned onthe-insidebf u lthetubefsothatgthefvalvefstem,36;protrndesV on, the outsidefof the-rubber` tub-e535 through 55. 'A vpapholer'previously cutgin the latter",(see Figs.V 4'J and 5) 'Inorder 'tofproperly stitch the l valve' pad 4 3'yto lthev vrubber tubef35 Ic'onvsidreil `-able pressure is required and 1 my f invention rJlhe' operation of the machine to attain this result is as follows. 1-

The valve k12 is set so as to openthetop :cylinder connection-15 to the air supply pipe 14 and to open the bottom cylinder connection `16 to theexhaust, but no cylinder action is lloc f i attained as the valve' 17. is still closed. lThe end of a rubber tube 35,near Which avalve pad 43 with its valve stem'36 has been inserted, .e -is placed-overl the arm'r- 32' and the operator f raises' theflev'er 24 toraisethe con-cave platen until the latter engages the outside of the rubber tube and presses the top vof the valve pad 43 into engagement with the arm 32. Thevalve stem 367 asis'shovvn in' Fg."4, eX-

ytendsthrougnthe'hole 31 of the platen 30V and serves to'pofsitionthe valvepad 43in l respect to the Varm 32.1l Asis shown i'nllig. 4,l the piston rod remains stationary, but as soon as the'ioot-lever 18 ispress'ed to open the valve 17 .the cylinder Voperates to raise the piston rod thus applyin-gl5the desired pressure, as shown 'in F ig. 5. As the leverr24 is belowlthe' pin 26 the shock, due tothe p-iston. 19 striking the lrubber,palcl'iing 27, is not transmitted tothe operatorshand. The

ried by the support to move the platen carried by the sleeve toward the platen iXed to the support7 and means operable to move the rod in the sleeve toV press the platens t0- gether.Y v v v Y V2. A device of, the character described coinprisingha platen over' which the vend of a tube may be telescoped, said Yplaten being formed to receive the inner face of a valve pad positioned adjacentth ,end ofthe tube,

i-a secondlrplaten" shaped to'rfec'eivel thevalve stein of the valve pad and tol` engageztheoutside' lofthe tube opposite the first namedV platen, means .tomove the second platen into engagement with the:r tube and means to apply an impacting pressure against the second platen to u'fite the valve 'padto the W'all' of the tube.'

Y CHARLES i entre MAYNABD. Y

voperator continues to press the foot lever and after stitching is complete by vsimply lreversing the valve 12 the pistonrod 19 `is lowered as vsoon as it has V reached its lowermost"positionthe valve 12V is brought backftofneutral.; The operatorV then releases I ptheilfoot, lever 18 andlovvers thearm 24 to i return all the .parte to their. starting posiftions.

' After thisoperation the skived endsuoilthe gether/andl, to accomplish the` stitching of itube35* are 'brought around. to 4be spliced tothissplice'onithe machine I liave'provided,

as 'shown in Fig. 6, a platen formed to e fit the'undelrsideof erin 32 andfWhich-isat- Y ,tachedto the latterby abolt 38'V passing .through the hole 34 of the'arm 32 and held in placegby a Wing `nnt- 39, Another. platen 40 isprovided with a 4groove 41 to engage Having the@ descrittev my invention', I Gleim; e e

vLA device'of the character" described VAthe concave platen k30 and a rodu42` attached to` the platen 40 lits inthe hole3lfofthe V'platenv 30 tot position the platenr40. The t splice ofthe tube 35 is then inserted between Y' y the lplatens '37 and 40V and the operation .of fthe machine is repeated except that this time Y the preliminary .movement of theI lower Y vp'laten'by lever,` '24 may be ornit'ted.n 

